Abstract : The behavior of a circular dielectric resonator under certain critical operating conditions is discussed. The general expressions for the performance and energy losses of a finite circular resonator which were derived in Part I (AD-634 248) of the article are applied to this case. It is concluded that only lower axial oscillations may occur at threshold pumping levels. At higher pumping levels nonaxial modes may also occur, resulting in a broadening of the beam. (Author)